论文标题
528.6 Hz积聚毫秒的X射线脉冲脉冲马长
The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195
论文作者
论文摘要
我们提出了在新的X射线瞬态Maxi J1816-195中发现528.6 Hz脉动的发现。使用METER，我们在28天的时间内观察到了中子恒星低质量X射线Maxi J1816-195的首次记录的瞬态爆发。从对528.6 Hz脉动的定时分析中，我们发现二进制系统被很好地描述为圆锥形轨道，轨道周期为4.8小时，预计的半超轴轴为0.26轻秒，pulsar的光线为0.26轻，将捐赠星的质量限制在捐赠者的质量上为0.10-0.55 m _ $ _ \ odot $。此外，我们观察到15次热核X射线爆发，显示了形态的逐渐演变，并且复发时间短至1.4小时。我们没有检测到光球半径扩展的证据，在8.6 kpc的源距离上占据了上限。
We present the discovery of 528.6 Hz pulsations in the new X-ray transient MAXI J1816-195. Using NICER, we observed the first recorded transient outburst from the neutron star low-mass X-ray binary MAXI J1816-195 over a period of 28 days. From a timing analysis of the 528.6 Hz pulsations, we find that the binary system is well described as a circular orbit with an orbital period of 4.8 hours and a projected semi-major axis of 0.26 light-seconds for the pulsar, which constrains the mass of the donor star to $0.10-0.55 M_\odot$. Additionally, we observed 15 thermonuclear X-ray bursts showing a gradual evolution in morphology over time, and a recurrence time as short as 1.4 hours. We did not detect evidence for photospheric radius expansion, placing an upper limit on the source distance of 8.6 kpc.
